Generally a good place to gain experience - Anonymous employee Bally's Interactive Employee Review

There's a genuine developer culture on the front-end and you are encouraged to be pro-active with new technologies. I've heard that dev teams (for games) have become smaller, leaner and fairly autonomous, but backed with the resources (e.g. internal workshops on new tech) that a largish corporation like Gamesys can offer. So all in all a good place to both start out as a junior dev and also hone your skills as an experienced developer.